Damaged Tracks Caused Montana Amtrak Derailment, Investigators Say
New York Times
An Amtrak derailment near Joplin, Mont., that also injured dozens was caused by poorly-maintained tracks that should have been inspected and replaced, the National Transportation Safety Board​ said.
https://www.nytimes.com/2023/07/27/us/amtrak-derailment-montana.html